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I feel like something is lost in translation here, but is this an option to retrofit etube connections to old dura ace 7970 derailleurs?Very interesting. English instructions available here:http://si.shimano.com/php/download.php? ... 00-ENG.pdfIt appears Shimano has created a new 10-speed di2 rear derailleur (RD-7970-A) that uses e-tube rather than the old 5-pin dura ace connectors. It uses an additional junction box (SM-RD79-A) to convert from the old style connector (EW-7970) to the new e-tube connectors (EW-SD50). If this is real, that is a great option for people with old groups that have a toasted rear derailleur. What is exciting for me is the potential for purchasing a new 10-speed rear derailleur, as I am building up a gruppo of old 6770 parts and am unable to find a reasonably priced RD. If there was a junction box that converted the reverse, from e-tube from to 5-pin di2, that would be fantastic too as there are a boat load of first-gen 7970 rear derailleurs out there.

Madison are the official Shimano UK importer. I think they have a consumer facing site as well, but I'm not sure if you are able to buy direct, normally orders go through a retailer.

They have the 7970a mech in stock. Certainly, a UK retailer with a Madison account could order it for a customer. The current suggested retail is £549! The 6770 is also available new, suggested retail is £249….. I'm sure there would be some room for negotiating a lower purchase price…...

The GB pound has fallen in value quite a bit recently, seems to be resulting in higher prices for this sort of stuff for us in general.